iCOM
Control Training and Service Manual
The path of a signal from beginning to the end - using the four block process.
The temperature sensor senses a rise in temperature. The rise is transmitted to
the
C
entral
P
rocessing
U
nit (CPU). The CPU looks into its memory for information
and instructions on what to do with the rise in temperature. The CPU then makes
the decision to call for cooling.
MICRO
OUTPUT
MEMORY
INPUT
C P U
T/H
LOAD
Isolation
We use the opto-isolator and the triac to isolate areas of control and voltage.
There are three areas of control and two voltage levels. Digital control comes from
the microprocessor at 5 VDC and the other voltage level is 24 VAC. One voltage
is used to turn on the triac and the other is used to operate the load device.
Areas of Control
OPTO
3.3 VDC
Ground
Load
Device
Transformer
Power 24 VAC
ISOLATION
ISOLATION
Processor
3.3 VDC Signal
POWER
CONTROL
DIGITAL
Transformer
Power 24 VAC
TRIAC
147
Содержание Liebert iCOM
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